作为后备保护,距离保护广泛用于各电压等级的线路及元件保护,为确保方向性,距离保护一般采用正序电压作为极化电压,但正序极化电压在系统非全相运行工况下可能无法正确反映故障前电压。本文介绍了一起单侧电源系统距离保护Ⅰ段在反向故障时误动的事例,分析了利用正序电压作为距离保护极化电压存在的不足,并提出了相应的解决方案,最终RTDS实验结果验证了本方案的正确性。
As a backup protection,distance protection is widely used as line and component protection for each voltage level.In order to ensure the direction,positive sequence voltage is used as the polarization voltage for distance protection.However,the positive sequence polarization voltage may not reflect the pre-fault voltage correetly when the system is in open-phase operating conditions.This paper introduced a mal-operation case of distance protection for a reverse fault,analyzed the disadvantages of using positive sequence polarization voltage,and proposed corresponding solutions.Finally,experiment results of RTDS validate the correctness of the scheme.
沈军,张洪喜,王忠,赵青春,张春合,朱晓彤.一起距离保护误动事例分析以及解决方案[J].电力工程技术,2017,36(3):100-104
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